Projects per year
perturb these natural processes. Therefore, the impact of dumping of dredged sludge, shipyard activities such as blasting of boat hulls and the mixing of polluted Scheldt estuary water with less polluted coastal water on the mobilization of trace metals and oxyanions in the sediments was studied in the pre- and post-bloom period (March and October) in Belgian Coastal Zone (BCZ). Vertical profiles of total and labile dissolved trace element concentrations, dissolved sulfide, pH and redox potential were assessed in sediment porewaters. Generally, total and labile dissolved
element profiles in the porewaters are well correlated, showing higher concentrations in March when the redox potential is lower and sulfide concentrations higher. Low pH levels were documented together with high amounts of Fe and associated elements in March at the dumping station. At the coastal station in the vicinity of the shipyards, sediment porewaters are enriched in dissolved Zn while at the mouth of the Scheldt estuary the highest dissolved Cu levels were found. Theoretical calculations with Visual MINTEQ confirm the increased Fe and associated element concentrations in March (lower pH) and the lower metal concentrations in October (lower Eh). R values, ratio of labile dissolved to total dissolved concentrations, reflect the potential of the solid sediment phase to supply labile elements to the porewater. They were lowest for Cu and highest for V. This study showed that anthropogenic activities in the BCZ such as dumping of dredged sludge and blasting of boat hulls have a serious impact on the levels, distribution and bioavailability of contaminants in the sediments, which may form a real threat to the benthic ecosystem.
- Biogeochemical cycle
- Trace metals and oxyanions
- Labile concentration
- Sediment porewater
- Anthropogenic activities
- R values
FingerprintDive into the research topics of 'Anthropogenic activities influence the mobilization of trace metals and oxyanions in coastal sediment porewaters'. Together they form a unique fingerprint.
- 2 Active
Mingyue Luo (Participant)12 Jun 2022 → 15 Jun 2022
Activity: Participating in or organising an event › Participation in conference
Anthropogenic activities influence the mobilization of trace metals and oxyanions in coastal sediment porewatersMingyue Luo (Speaker)13 Jun 2022
Activity: Talk or presentation › Talk or presentation at a conference